Improvement in tilting chairs



H. G. E. WOLPF. Tilting-Chairs.

No. 197,195. Patented Nov. 13, I877.

UNITED, STATES PATENT OFFICE.

HERMAN WOLFE, OF MILWAUKEE WISCONSIN.

IMPROVEMENT IN TILTING CHAIRS.

Specification forming part of Letters Patent No. 197,195, dated November13, 1877; application filed May 12, 1877.

To all whom it may concern: Be it known that I, HERMAN G. EIWOLFF, ofMilwaukee, Wisconsin, have invented certain new and useful Improvementsin Chairs, 3 of which the following is a clear, full, and exactdescription, reference being had to the accom- I panying drawings,forming a part of this specification, in whichv Figure 1 is a verticalsection of a chair with my improvements attached. Fig. 2 is a horizontalsection, showing the bottom of the chair.- Fig. 3 is a detail sectionthrough a: as of Fig. 1.

My invention relates to revolving chairs which are designed to tilt backon a spring; and it consists in the combination of devices, hereinafterexplained and claimed.

In the drawings, A represents the seat of a .chair, having secured tothe under side the metal frame a at, having its central plate B curvedand provided with the lugs 11, fitting inside of the casing O, andsecured thereto by means of the pivot-bolt d, passing through the lugsand the ends of the casing. The

ends of the casing are rounded to fit in the curve B and receive thepivot-bolt d, and the sides are provided with the shoulders e e, to stopand hold the curved plate B as the chair is'rocked backward or forward.

Extending out horizontally from the rear of the casing O is the rod E,provided with a spiral spring, 8, bearing against the casing G,

and a screw-nut to hold the spring in place and adjust its tension. Therod E passes through the casing, and is rigidly attached to the slidingfiont plate 0, which has a common movement with the rod, as hereinafterexplained.

On the interior of the plate 0, I construct, at

t each end of the plate, a beveled or knife-blade projection, f, againstwhich press the lower ends of the lugs b as the body of the chair isrocked backward, thus forcing forward the rod E, whereby the spiralspring 8 is compressed, and an easy, pleasant movement is given to thechair, until the rear portion of the curved plate B rests steadily uponthe shoulder e of the casing C, which is firmly attached to thescrew-rod H, which passes down into the leg-frame I, in the usual mannerof chairs of this class. 7

Having thus explained my invention, what I claim as new, and desire tosecure by Letters Patent, is

In a revolving chair, the frame a a, provided witli the curved plate Band lugs b, in combination with the casing 0, provided with theshoulders c 6', rod E, provided with the sliding plate 0, having thebeveled or knife-blade projections f f, and the spiral spring 8, allcombined to operate substantially as and for the purpose set forth.

HERMAN G. E. WOLFE.

Witnesses:

J. A. BECKER FRANKLIN A. lBEcnEn.

